Oxygen Sensor, Part 4016021, is an O2 sensor for the exhaust on your motorcycle. It is designed and tested by Indian Motorcycle Engineers to ensure quality, durability and optimal performance through tens of thousands of miles of on-road testing to ensure the part can withstand the life of your motorcycle. It's also undergone environmental, vibration, temperature cycling, humidity, salt spray and water immersion testing. Spend less time working on motorcycle maintenance and more time exploring what the roads have to offer. As a brand that started in 1901, don't settle for anything less than OEM quality.